JP2005111441A - Microbiologically treatable molding and biological treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbiologically treatable molding which has high strengths and exerts such a good influence on a microbiologically treatable molding-incorporated unit that the rising time since the operation of the unit is started until the unit comes into a stable condition can be made short and with which organic matter in the water to be treated is removed excellently, and to provide a biological treatment apparatus using the microbiologically treatable molding as a microbe carrying carrier. <P>SOLUTION: The microbiologically treatable molding is obtained by superimposing a flat plate-shaped member 2 on a corrugated plate-shaped member 1 containing an activated carbon fiber. The flat plate-shaped member 2 is composed of a textile fabric. The peak height (H) of the corrugated plate-shaped member 1 is 5-100 mm and the peak pitch (P) is 5-100 mm. The flat plate-shaped member 2 can be composed of a synthetic resin film. This microbiologically treatable molding is used in the biological treatment apparatus as the microbe carrying carrier. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is an ultrapure used in ornamental fish, aquaculture water purification, hydroponics water purification, food factory effluent, kitchen effluent, general effluent treatment including organic matter such as sewage, semiconductor factory effluent treatment, semiconductor industry, etc. The present invention relates to a molded article for microorganism treatment and a biological treatment apparatus that can be used as a microorganism carrier in a recovery system after use of water.

  At present, research on a biological activated carbon method in which water is treated using activated carbon as a microorganism carrier is actively conducted. The biological activated carbon method is said to be able to treat difficult-to-decompose substances by increasing the contact time between microorganisms and substrates, and adsorption and removal of inhibitory factors, and to increase biological treatment efficiency. .

Conventionally, spherical or granular activated carbon is used as a carrier used in the biological activated carbon method, and there are a fluidized bed method (up flow) and a fixed bed method (down flow) as a treatment method, but a fluidized bed method (up flow). ) Is common. However, the fluidized bed method has the following drawbacks.
(1) When aeration cleaning is performed, activated carbon flows out, so that the biological treatment tank cannot be cleaned. Therefore, if the operation is performed for a long time, the amount of microorganisms in the tank becomes excessive and the processing capacity decreases.
(2) Since pulverized coal is generated, clogging occurs in the downstream membrane separator when the downstream membrane separator is installed.
(3) The activated carbon is aggregated and formed into a lump by the biofilm and adheres to the tank wall or the like, whereby the flow of the liquid to be treated becomes non-uniform (so-called single flow occurs).
(4) It is difficult to keep activated carbon in a fluid state, and maintenance is complicated.
(5) Since it is necessary to increase the amount of water to be treated in the tank in order to maintain the fluid state, indirect aeration of a type in which a circulation tank is provided in addition to the tank and aeration is performed here.
(6) In the case of a fluidized bed, activated carbon collides with each other in a fluidized state, so that the biofilm attached to the surface tends to be peeled more easily than in the case of a fixed bed. For this reason, especially when the growth rate of microorganisms is inherently slow, such as when treating water to be treated with a low concentration of organic matter, such as ultrapure water after use in the semiconductor industry, the device operates. The time (rise time) from the start to the stable state becomes longer.

  On the other hand, in the treatment by the fixed bed method (down flow) using spherical or granular activated carbon, there is a problem that the biofilm around the activated carbon is enlarged in a relatively short time and is immediately clogged.

  In order to solve the above problems, Patent Document 1 proposes a biological treatment apparatus that uses a molded body in which felt cloth-like activated carbon fibers are attached to a nonwoven fabric so as to be corrugated.

However, this apparatus has a problem that the strength of the molded body is weak because the nonwoven fabric to which the felt cloth-like activated carbon fibers are attached has a loose structure.
Japanese Patent No. 3107950

  The present invention solves the above problems, has a high strength, and has a short rise time from the start of operation of the built-in apparatus until it becomes stable, and is excellent in the removal of organic substances in the water to be treated. It is a technical problem to provide a molded article for use and a biological treatment apparatus using the molded article for microorganism treatment as a microorganism carrier.

  As a result of intensive studies to solve the above problems, the inventor of the present invention appropriately defines the shape of the corrugated plate-like member mainly composed of activated carbon fiber and adheres the corrugated plate-like member to the flat plate-like member. As a result, the inventors have found that a member composed of a woven or knitted fabric or a synthetic resin film may be used, and reached the present invention.

That is, the gist of the present invention is as follows.
(1) A molded body formed by laminating a flat plate member and a corrugated plate member containing activated carbon fibers, wherein the flat plate member is formed of a woven or knitted fabric, and the peak height of the corrugated plate member is A molded article for treating microorganisms, characterized in that it has a pitch of 5 to 100 mm and a mountain pitch of 5 to 100 mm.
(2) A molded body in which a flat plate-like member and a corrugated plate-like member containing activated carbon fibers are overlaid, wherein the flat plate-like member is composed of a synthetic resin film, and the peak height of the corrugated plate-like member 5 to 100 mm, and the pitch of the mountain is 5 to 100 mm.
(3) A biological treatment apparatus using the microorganism treatment molded article according to (1) or (2) as a microorganism carrier.

  According to the present invention, the microorganism treatment is high in strength, has a long life, and has a short rise time from the start of operation of the built-in apparatus until it becomes stable, and is excellent in removing organic substances in the water to be treated. And a biological treatment apparatus using the microorganism treatment molded body as a microorganism carrier.

  Hereinafter, the present invention will be described in detail.

  The molded article for microbial treatment of the present invention is a molded article in which a flat plate member and a corrugated plate member are stacked. For example, as shown in FIG. 1, the corrugated plate member 1 and the flat plate member 2 are joined up and down, and a through hole 3 exists between the corrugated plate member 1 and the flat plate member 2, so that The molded article X for microbial treatment of the invention is formed.

The corrugated plate member is obtained by processing a sheet-like material mainly composed of activated carbon fiber and binder fiber into a corrugated plate shape. As a sheet-like material to be a corrugated member, in consideration of the supportability of microorganisms, dropping of activated carbon fibers and economic efficiency, the basis weight is 40 to 200 g / m ² , the activated carbon fiber content is 5 to 40% by mass, and the thickness. Is preferably 0.2 to 5 mm, more preferably a sheet having a basis weight of 50 to 100 g / m ² , an activated carbon fiber content of 10 to 30% by mass, and a thickness of 0.5 to 3 mm.

As the activated carbon fiber used for the corrugated plate member, those synthesized from coal pitch-based, phenol-based, cellulose-based fiber and the like can be used. The specific surface area of the activated carbon fiber is preferably 500 to 2500 m ² / g.
The binder fiber used for the corrugated plate member together with the activated carbon fiber is preferably a heat-fusible fiber which is a composite fiber having a core-sheath structure made of polyolefin such as polyester, polyamide, ethylene vinyl alcohol (EVA), polypropylene or polyethylene, Binder fibers made of polyolefin for both the core and the sheath are particularly preferable because they are hardly decomposed by microorganisms.

  As the flat plate member that forms the molded article for microbial treatment of the present invention together with the corrugated plate member, a woven or knitted fabric or a synthetic resin film used for industrial materials can be adopted, but from the viewpoint of water permeability and air permeability. Is preferably a woven or knitted fabric, particularly a rigid mesh. Woven fabrics and knitted fabrics have higher strength than non-woven fabrics because the yarns constituting them are continuous (filaments) or constrained by twisting (spun yarns), and also constrained by woven or knitted fabrics. In addition, since the synthetic resin film is stronger than the fiber, any of them can improve the strength of the molded article for microbial treatment of the present invention.

  As the polymer constituting the flat plate member, both woven and knitted fabrics and synthetic resin films may be polyolefins such as polyethylene and polypropylene, polyamides such as nylon 6 and nylon 6.6, polyesters such as polyethylene terephthalate and polybutylene terephthalate. it can. Moreover, although what consists of glass fiber can also be used for a woven / knitted fabric, since the flat plate member which consists of polyolefin is hard to be decomposed | disassembled by microorganisms, it is preferable.

  The flat members used in the present invention preferably have a thickness of 30 to 500 μm, particularly 50 to 300 μm for both woven and knitted fabrics and synthetic resin films. Moreover, in the case of a mesh-like woven or knitted fabric, the number of yarns between 50 mm is preferably 10 to 100, and more preferably 20 to 50.

  The molded body for microbial treatment of the present invention needs to have a peak height (H) of 5 to 100 mm and a pitch (P) of 5 to 100 mm of the corrugated member, and the peak height of 8 to 80 mm and the pitch of 8 to 80 mm. Preferably, the peak height is 10 to 50 mm and the pitch is 10 to 50 mm. If the peak height or pitch of the corrugated member is less than 5 mm, microorganisms are likely to be clogged in the through holes formed by joining the corrugated member and the flat member, and the ability of wastewater treatment is reduced. Moreover, when the peak height or pitch of the corrugated plate member exceeds 100 mm, the contact between the microorganisms and the waste water is not successful, and a good waste water treatment cannot be performed.

  The molded article for microbial treatment of the present invention is filled in a treatment tank 4 of a biological treatment apparatus as shown in FIG. 2 (fixed bed), and treated water is treated from below by a treated water tank 5 with a pump 6. While supplying into the tank 4, it processes by blowing air in the process tank 4 with the air pump 7, and takes out a process liquid from the upper part of the process tank 4. FIG.

  Next, an example of a method for producing the molded article for microbial treatment of the present invention will be described.

  First, after blending the activated carbon fiber and the binder fiber at a predetermined mass ratio, a felt-like activated carbon fiber sheet composed of the activated carbon fiber and the binder fiber is formed using a card machine such as a random card or a parallel card.

  The felt-like activated carbon fiber sheet formed in this way is processed into a corrugated plate member by processing with a single feather or a double feather, and this and a flat plate member are overlapped, and the contact is bonded with a hot melt adhesive. A honeycomb-shaped molded article for microbial treatment is produced. The microorganism-treated molded body thus produced can be made into a block-shaped microorganism-treated molded body by further overlapping and adhering in multiple stages. Moreover, it can also be set as the cylindrical microbial treatment molded object by winding up the microbial treatment molded object of FIG. 1 in a cylinder shape.

  As an adhesive for bonding the corrugated plate member and the flat plate member, a hot melt adhesive such as polyester, polyamide, polyolefin, ethylene vinyl alcohol (EVA) or the like can be preferably used, but a hot melt adhesive such as polyolefin or EVA can be used. The adhesive is particularly preferable because it is difficult to be decomposed by microorganisms.

  The molded article for microbial treatment of the present invention is high in strength, shortened the start-up time from the start of operation until reaching the target treated water quality, and excellent in removal of organic substances in the treated water. It is suitable for use in the treatment of water with a low organic concentration such as a concentration of 20 mg C / L, such as wastewater treatment in a semiconductor factory or a recovery system after use of ultrapure water used in the semiconductor industry, etc. However, it can also be applied to purification of ornamental fish and aquaculture fish water having higher organic matter concentration, purification of hydroponics, food plant wastewater, kitchen wastewater, sewage and other general wastewater containing organic matter.

Next, the present invention will be specifically described with reference to examples.
(Example 1)
Activated carbon fiber M (specific surface area 700 m ² / g: Adol A-7 manufactured by Unitika Co., Ltd.), polyolefin binder fiber N consisting of polypropylene as the core component and polyethylene as the sheath component (ESC sheath melting point: 80 ° C. manufactured by Daiwabo Co., Ltd.) Is formed using a parallel card and a nonwoven web having a mass ratio (M: N) of 20/80 is formed. An interwoven nonwoven web was created that was entangled. Subsequently, the nonwoven web was passed through a dryer at a temperature of 130 ° C. to produce a felt-like activated carbon fiber sheet having a basis weight of 60 g / m ² and a thickness of 1.8 mm, and then this sheet was molded with a single feather. Thus, a corrugated plate member having a peak height of 20 mm and a pitch of 15 mm was obtained.

  Next, a polypropylene mesh (manufactured by Kureha Gosei Co., Ltd., polypropylene mesh, 35 yarns between 50 mm) is used as the flat plate member, and EVA is applied to the ridge line portion of the corrugated plate member obtained above. A hot-melt adhesive was applied, the adhesive side was stacked on a flat plate member, and heat treated to obtain a molded article for microbial treatment in which the corrugated plate member was thermally bonded to the polypropylene mesh.

This molded article for microbial treatment was overlapped several times in the vertical direction and adhered with an EVA hot melt adhesive to obtain a molded article A for block microbial treatment. (Size: 400 × 400 × 400mm)
(Example 2)
A molded product B for microbial treatment was obtained in the same manner as in Example 1 except that a synthetic resin film (manufactured by Toray Industries Inc., unstretched polypropylene film thickness 100 μm) was used as the flat plate member instead of the polypropylene mesh.
(Comparative Example 1)
A molded article C for microbial treatment was obtained in the same manner as in Example 1 except that a polypropylene nonwoven fabric (weight per unit area: 40 g / m ² ) was used as the flat plate member instead of the polypropylene mesh.

  Next, using the biological treatment apparatus shown in FIG. 2, the microorganism treatment molded body A (Example 1), the microorganism treatment molded body B (Example 2), and the microorganism treatment molded body C ( Comparative Example 1) was filled (fixed bed) and the total organic carbon content (TOC) was removed. In this case, air was blown into the treatment tank 4 by the air pump 7 at a rate of 10 ml / second. The water to be treated was water having a TOC concentration of about 20 mg C / L containing methanol, acetone and isopropanol as main components, and was supplied so that the residence time in the treatment tank 4 was 10 minutes.

  FIG. 3 shows the relationship between the operation time (elapsed time) and the TOC measurement result of the obtained treated water. In addition, TOC measurement was performed using the TOC meter (Shimadzu Corporation TOC-5000).

  As is clear from FIG. 3, when the microorganism-treated molded bodies A and B of Examples 1 and 2 are used, a predetermined treatment performance is exhibited about 10 days after the start of the treatment. When the microorganism-processed molded article C was used, the time when the effect was exhibited was from about the 20th day because the contact efficiency between the waste water and the activated carbon fiber was poor.

  In addition, in the apparatus using the microorganism-treated molded body C, the TOC concentration was stable at about 4 mg C / l from about 20 days to 60 days later, but is this because of insufficient strength of the nonwoven fabric used for the flat plate member? The shape started to collapse after about 60 days, and after 120 days, the shape could not be retained and the TOC concentration increased, so the measurement was stopped.

  On the other hand, the microorganism-treated molded bodies A and B did not have a problem such as the shape being lost after 180 days, and the treated water quality was stable at about 2 to 3 mg C / l.

It is explanatory drawing which shows the basic structure of the molded object for microorganisms treatment of this invention. It is explanatory drawing which shows one embodiment of the biological treatment apparatus of this invention. It is a graph which shows the relationship between operation time (elapsed time) and the TOC measurement result of the obtained treated water. X Molded body for microbial treatment 1 Corrugated plate member 2 Flat plate member 3 Through hole 4 Treatment tank 5 Water tank to be treated 6 Pump 7 Air pump

Claims (3)

  A molded body in which a flat plate member and a corrugated plate member containing activated carbon fibers are overlaid, wherein the flat plate member is composed of a woven or knitted fabric, and the peak height of the corrugated plate member is 5 to 100 mm. A molded article for microbial treatment, wherein the pitch of the mountain is 5 to 100 mm.   A molded body in which a flat plate member and a corrugated plate member containing activated carbon fibers are overlaid, wherein the flat plate member is made of a synthetic resin film, and the peak height of the corrugated plate member is 5 to 5. A molded article for microbial treatment, which is 100 mm and has a mountain pitch of 5 to 100 mm. A biological treatment apparatus using the microorganism treatment molded article according to claim 1 or 2 as a microorganism carrier.

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